Combination tractor implement



March l, 1932. R. w. KNAPP ET AL COMBINATION` TRACTOR IMPLEMENT FiledNov 19, 192'. 12 Sheets-Sheet l 12 Sheets-Sheet 2 R. W. KNAPP ET ALCOMBINATION TRACTOR IMPLEMENT Filed NOV 19, 1927 March 1, 1932.

March l, 1932., R- w KNAPP ET AL 1,847,249

COMBINATION TRACTOR IMPLEMENT Filed Nov 19, 1927 12 sheets-sheet sHTToR/Yfr March 1, 1932. R. w. KNAPP ET AL COMBINATION TRACTOR IMPLEMENTFiled Nov 19. 1927 12 Sheets-Shes?l 4 TTURNEY Marcin L, m32. v i?. w.KNAPP ET AL COHBNATION TRACTR IMPLEMENT Filed Nov 19.

1927 12 Shees-Sheeil 6 March 1, 1932. R. w. KNAPP ET AL.

COMBINATION TRACTOR` IMPLEMENT Filed Nov 19, 1927 12 Sheets-Sheff@ 71932. R. w. KNAPP ET Al. 1,847,249

COMBINATION TRACTOR TMPLEMENT Filed Nov 19, 1927v 12 sheets-sheet 8Maxch 1 12 Sheets-Sheet March 1, 1932. R, w. KNAPP ET Al.

I COMBINATION TRACTOR IMPLEMENT Filed Nov 19 1927 March 1, 1932. R, w,KNAPP Ef AL 1,847,249

COMBINATION TRACTOR IMPLEMENT 12 Sheets-Sheet 10 Fil-ed NOV 19, 1927 C nl BV /f March 1, 1932.

R.- W. KNAPP ET AL COMBINATION TRACTOR IMPLEMENT Filed Nov 19. 1927 .12Sheets-Sheet ll NH 7 S. F Q. W P o/ Q 92,. N N Wh oNn n om: OIM-H 1 w\1\\w Om W n f w M vm/ u RH ANH om." M M un." .n.. .H N 0 u @N .a 8 Hmwa. ed mma :WN Ouv w o m A# o u* #.1 wud 4 on. n .NNNRN n# nu." N .35%mmm Paateriied` Mar. l, 1932 TTES PATENT OFFICE ROLAND W. KNAPP AND'HOLLAND J'. KNP?, GF VVAYZATA, MINNESOTA.

COMBINATON TRACTOR IMPLEMENT Application filed November 19, 1927. SerialNo. 234,494.

This invention relates to tractors, to combination tractor-implements,and to implements for attachments t-o tractors, and one of the mainobjects is to provide a highly e eilicient, comparatively simple, andpractical tractor unit, which is capable of independent use, as such,but which when coupled with an implement, or implements, in the mannerhereinafter specilied, is so associated with l0 the same that thetractor is rendered particularly elective and valuable in assisting inthe work of the implement, and, conversely, the implements are soassociated with the tractor that they are rendered especially eihcientfor 15 the Work they are intended to do. A further object is to providemeans of a novel nature for associating or connecting an implement witha tractor so that both the tractor and the implement may be under theobservation 20 `and control of a single operator. vA further object isto provide means for adjustably securing an implement, such as a tillagedevice, at the front end of the tractor, Where it is most convenientlyobserved and controlled,

25 but which means will also connect the implement to the rear end ofthe tractor by an element, independent of the tractor frame proper,whereby the tractor frame will not be subjected to the usual stressesand distor- 5'3 tional reactions that occur Where the implement isfirmly attached to the end of the tractor that is opposite from thetraction members.

Still further and more specific objects,

V such as are incident to'improvements in implement structures proper,adjusting devices, power transmitting mechanisms,draft transmittingconnections, etc., will be disclosed in the course of the followingspecilication,

9 reference being had to the accompanying drawings, wherein:

Fig. 1 is aside elevation of our improved tractor showing the method ofapplying front and rear cultivator units thereto, the major i5 portionof the rear cultivator unit, however,

being broken away for laclr of space.

Fig. 2 is a plan view of the machine as shown in Fig. 1.

Fig. 3 is a plan view of the rear cultivator Fig. 4 is a front elevationof the machine as shown in Figs. land 2.

Fig. 5 is a side elevation of the rear cultivator unit, as it would beseen if applied to the rear (left) end of the tractor as seen in Fig. 1,`the earth engaging devices being sholwn as in working engagement withthe soi ig. 6 is a view similar to Fig. 5 but showing the earth engagingdevices in their lifted ank inoperative positions.

Fig. 7 is a rear elevation of the rear end or the tractor unit proper,and showing a draw bar adjusting mechanism.

Fig. 8 is a side elevation (from the left) ot' the tractor unit proper,and as seen when stripped of all working implements.

Fig. 9 is a rear elevation of the tractor,- shown in Fig. 8.

Fig. 10 is a front elevation of the tractor i shown in Figs. 8 and 9.

Fig. 11 is a rear view of the tractor, as seen in Fig. 9, butillustrating how the forward truck may be shifted to one side,` and thepositionthat various parts assume for instance when the machine is usedin plowing.

Fig. 12 is a rear elevation, similar to Fig. 9, but showing how the reartruck may tilt, independent of the tractor body proper, when the machineis travelling on uneven ground. FH

Fig. 13 is an enlarged sectional elevation as seen on a central planetaken vertically and longitudinally through the rear portion of thetractor unit.

Fig. 14 is a sectional elevation on the line FF 14-14 in Fig. 13.

Fig. 15 is an enlarged sectional elevation through the diiierentialmechanism, as on the line 15-15 in Fig. 16, with a few parts removed. -f

Fig. 16 is a plan view of the rear part of the tractor, with variousparts shown in section for purpose of illustration.

Fig. 17 is an enlarged detail View partly in section, of the powerpulley and its driving and control mechanism.

Fig. 18 is a detail section on the line 18-18 in Fig. 17.

Fig. 19 is a front elevation of the machine, the same being providedwith a modified ""J form of forecarriage whereby a two row cultivatormay be employed.

Fig. is a side elevation of the modified forecarriage, as seen from theleft in Fig. 19.

Fig. 21 is a right side elevation of the front portion of the machine,showing it as having a plow device connected thereto, and with certainparts broken away for purpose of illustration.

Fig. 22 is a front elevation of the machine shown in Fig. 21, but withthe plow removed.

Fig. 23 is a sectional plan view on the line 23-23 in Fig. 21.

Fig. 24 is an enlarged detail section on the Fig. 25 is an enlargeddetail elevation of the plow beam draft and adjustin mechanism as shownin Fig. 22, and partly in section, as on the line 25-25 in Fig. 26.

Fig. 26 is a detail plan view of an adjusting device, as on the line26-26 in Fig. 25.

Fig. 27 is a sectional detail elevation, as on the line 27-27 in Fig. 26

Fig. 28 is a sectional detail elevation on the line 28-28 in Fig. 27.

Fig. 29 is a detail section on the line .29-29 in Fig. 25.

Referring to the drawings more particularly and by reference characters,i designates the power unit proper, which` comprises the usual engineblock 3l, transmission housing 32, gasoline tanl; 33, radiator 34, ahood 35, and exhaust pipe 36. 1n the present instance t...e e" ine unitis one that has been and as sucii utilizes the clutch, brake, andreverse speed, foot levers 37, 38 and 39 that are used that type ofengine.

The engine is carried by and secured to a pair of side frame members 40,as by brackets 41a. The rear ends of the side beams or sills 40 are1igidly connected by an integrally formed castin unit B (see Fig. 16),while the forward ends of the side beams incline upwardly to a pointwhere they are conneetedby a transverse cross beam 41, which primarilyand adjustahly supports the front end ofthe tractor.

r1`he beam 41 has a pair of brackets 42 that detachably secure a roll-er43, and pair of brackets 44 that simil .rly secure a. guide pin 45.Slide-.bly secured over the beam 41 and under the roller 43 and pin 45is the upper horizontal rail 46 of an inverted, U-y shaped frame C, asshown in Figs. 1, 2, 4, 8, 9, 10,12, 21 and 22. The substituted butcorresponding frame D, as illustrated in Figs. 19 and 20 will bedescribed later.

As shown in Figs. 2, 4 and 10, the frame C is o aerativelv connected tothe bar or beam C suppor -s the front end of the tractor at a central ormedian point, but in Figs. 2, 4, 11 and 22 the frame is offset to oneside of the tractor. 1n the relatively wider frame l), as shown in 19,the shifting bar 47 need not be emploved as there is rarely occasion fortransversely adjusting' it, but it may be secured in properly adjustedpositions, by a pin 49.

l he lower ends of the frame C have spindles 50, for supporting groundwheels 51 that steer the machine. Each wheel is provided with a verticalturning shaft 52, and the two shafts have cranks 53 at their upper endsthat are connected by a cross bar 54 .so that they will turn or angle inunison. YY1] 55 that connects it to the crank 56of a steerg shaft 57having hand wheel 58. The is of a telescoping nature so that it may berigidly adjusted to various lengths to accommodate such relativeadjustments that may be made between the tractor and frame C, by themechanism 47-48.

ltmay here be noted that the rear end of the steering shaft 57 issupported in a bearing member carried at the upper converging ends of apair of brace bars 59 that eX- tend down along the sides of the engineunit; and, that the forward end of the shaft 57 is supported by atubular post 60; This post not only serves to support the shaft 57, butopen at its upper end and is tubularly connected at its lower end withthe carburetor of the engine, so that the air drawn into the latter willbe taken at a higher elevation, where. it is much cleaner than whentaken in at lower point near the road or field.

To retain the frame C in its vertical plane, yet transverselyadjustable, we provide the forward sections of the frame bars 4G with apairvof extension arms 61 whichv carry a.

pair ofspaced, parallel, and transversely eX- tending guide bars 62.These bars slidably receive the left leg of the frame C, and areconnected by bolts or rivets 63. An arm G4 is secured to and dependsfrom the bars 62 to form a support for an extension of the engine crank65. A rod 66-may be employed to brace the outer ends of the bars 62.Itwill thus be seen that while the forward ltinck or steering carriageof the tractor is adjustable from side to side, its connection with' thetractor is such that the tractor' will tiltwith the front wheels, asshown in Figs. 11, 12 and 22, and not with the rear or traction wheels,as is usually the case.

Attention is nowl directed to the construction of the rear part of thetractor, and reference `will particularly be made to the Figs. 1, 8, and13 to 18, inclusive. Y

The casting B, which is rigidly secured to the rear ends of the sills40, as at'67,fhas a central chamber 68, which isv immediately rearwardof the universal joint housing G9 ine cross bar in turn, is actuated bya bar l r l rojuently the pulley 79 may be engaged or disof the engineA; a rearwardly extending tubular housing or sleeve 70, and a laterallyextending, transverse sleeve 71. Y The universal joint 72 transmitspower from the 5 transmission gears of the engine to a short shaft 73that extends through the chamber 68 and into the rear end of the sleeve70. The shaft 7 8 is journ'aled in anti-friction bearings 74, one ofwhich is carried in a bearing ring 75 secured in the forward end of thechamber 68. Secured upon the shaft 7 8, within the chamber 68, is a.bevel pinion 7 6 adaptedto Ymesh with and drive a pinion 77 on the innerend of a shaft 78, whose outer end carries a power pulley 79 forstationary power purposes. The shaft 78 is journaled in bearings 80, inan inner sleeve 81, and the latter, is, in turn, mounted for limitedmovements, both 0 "longitudinal and rotating, in the outer sleeve 71. Apin 82 is rigidly secured to the sleeve 81 and projects out through anL-shaped slot 83 (in the sleeve 71) that is enlarged at both ends. A lugmember 84 is secured on the pin 82, and a spring 85a tends to press thislug toward the sleeves. enough to enter the enlargements at the ends ofthe slot 83, but is too large to move through `the angle portion of theslot. When the lug 9 is pulled out, however, the pin 82 may be movedthrough thepslot. Thus, the sleeve 81 may be movedin and out far enoughto throw the bevel pinion 77 into and out of engagement with the pinion76, and conseengaged from the engine, at will.

The rear end of the shaft 7 3, that projects into the sleeve 70, issquared, and slidably carries a clutch member 85, the longitudinal Olmovement of which is controlled by a yoke 86, a sliding shaft 87, and ahand lever 88. Access, for greasing and repair, to this clutch isprovided by removing a cover plate 89. The clutch member 85 is thusselectively made engageable with a 'complementing clutch member 90 (Fig.13), on the rear end of a drive shaft 91 that extends back into adifferential housing 92, where it is provided vwith a bevel pinion 93that drives a pair of shafts 94 and 95 through a conventional form ofdierential gearing 96 (see Figs. 18 and The shaft 94 has a spur pinion97, at its outer end., that meshes with and drives an internal ring gear98 of a traction wheel 99. The shaft 95 is a hollow shaft that operatesupon a reduced extension 94a of the shaft 94, so as to be braced inalignment therewith, and drives a traction wheel 100 through a pinionl101 and an internal ring gear 102.

The drive shaft 91 is j ournaled in a cylindrical housing 103, to therear end of which is rigidly secured the differential housing 92. Thehousing 103 is free to rotate in the sleeve into which it extends, butis secured against longitudinal movement by a flange The lug is large104 that is secured as by a split ring 105. Rearwardly of the housing70, the housing 103 is providedl with an underslung, transverselyyarranged bearing box 106, in which is journaled a supporting axle 107for the traction wheels 9944100. The hub of one of the wheels is securedupon the axle, while the hub of the other is rotatable thereon, so as to'permit the differential mechanism to properly operate. The journal boX106 has a lug 108 to which may be secured a draw bar 109 and a push beam110. The rear end of the draw bar `rests in a horizontally slottedbracket 111 where it may be selectively secured, as by pins 112, asshown in Figs. 9, 11 and 12. 'We prefer, however, to provide meanswhereby the draw bar may be transversely adjusted'hy the operator, whenthe machine is in'motion, so that various draft conditions may be dealtwith as they occur, and to this end, we provide the bracket 111 with apin 118, upon which is detachably secured (see Fie. 7 a hand lever 114,whose lower end is bifurcated to engage the draw bar, while its upperend is provided with a tooth and rack mechanism 115 for releasablysecuring it.

rEhe bracket 111 is trunnioned on the rear end of the differentialhousing 92, and at its upper end is secured te the rear leg of a frame116, that arches over the traction wheels and drive mechanism, and issecured at its front rnd to an extension 117 of the cast frameV B. thedrivers seat 118 is mounted upon this frame, and to protect the driverfrom the mechanism below, we provide the frame with a laterallyextending plate skirt 119. At the front of this skirt is a support orfoot board 120, carried on braces 121 that secure to the bars 59.

From the foregoing description it will be seen that the entire tractorunit proper, the frame 119, the operators seat 118, and the nracket 111,will tilt transversely, only as the widely spaced front wheels 51 willtilt and that the traction lwheels 99100 will have freedom to tilt on alongitudinal axis, as provided for by the bearing of the housing 103 inthe sieeve 70. It rwill also be seen that power can be applied,selectively, or simultaneously to both the traction wheels and to thepower unit.

1t may also here be noted that when a Ford engine is used the low, highand reverse speeds can be applied in the same manner as in the Fordautomobile, and that the brake pedal 38 is available, in the usualmanner, to apply the usual transmission brake. A hand lever 122 is shownas operatively connectedto a shaft 103. These members may be the usualemergency brake lever and shaft the Ford car, but as no emergency brakeis here employed, vweprovide the shaft 123 kwith an arm 124 thatoperates against a set screw 125 in an extension 126 of the brake pedal38, sol that hand power may be applied to the hand lever 122 tosupplement the toot power applied to the brake pedal 33.

wWhen equipped as a row crop cultivating machine, as shown in Figs. 1-6,inclusive,

the tractor wheels 99-100 travel between two adjacent rows of corn, orother crop, as does also the left front wheel 51, the trame C havingbeen'shitted to a right hand posi- .tion so that it will arch over therow of plants immediately to the right, the right wheel 51 thentravelling to the right ot this row. To loosen up the earth immediatelyadjacent to the row spanned by the right side of the trame C we providea pair of cultivator shovels or tools 12T-123 ot a cultivator unitdesignated generally by the character t, and to loosen up or plow thestrip oii'earth between the plant rows, which strip is travversed by thetraction wheels 9.9-160, we pro.-

{detachably secured, as at 134, to the upper or horizontal beam of Ahetrame C. Thus the unit E becomes transversely shittable with the trameC, when the latter is adjust` ed by the crank 43, and the tools 127-123are transversely shittable, when the machine is in motion, by steeringthe wheels 51.

The unit E is braced and pushed by the push cam 110, which attaches, at135,

to one leg ot the yoke 133. The connecting 'bolts for the `aeam 110 havesutlicient play to permit transverse shifting of the yoke 133, withoutbinding. The rear or shovel supporting ends ot the drag bars 130 areadjustably carried by a pair ot bars 136, the upper Aends of which havecollars 137 that siidably operate on the crank e d 133 et a cross shaft139 which is j ournaled in the frame beams 46. This shaft is ustablyoseillated by a bracket arm 140, that is connected by a link rod 141, toa manually controlled usting lever 142. Thus, by adjusting the handlever 142 the operator is able to lower and raise the cultivating toolsas may be required. 117e also Yprovide means whereby the tools may beVyieldingly raised under the action ot resisting obstructions which theymay encounter in the ground. This is illustrated in Figs. 1 and 4, andconsists in providing` a yielding Aconnection between the members 13()and 136.

Thus, we provide each bar 136 with a slot 143 in which operates a pin144 ot the bar 130. The drag bars 130 are yieldingly pressed down bysprings 145, but an unnatural strain Y'lon the shovelsswill permit thepins 144 to move up in the slots 143, so that the shovels may ride overthe obstruction.

The proximity ot the tools 127 and 128, with respect to each other, canbe regulated, to meet varying crop row conditions, by the manipulationof a hand lever 146, by the machine operator. This lever is connected byrod 147 to a goose neck lever 143V that pivots on a collar 149. Thiscollar is secured upon the crank 133, between the Vcollars 137, and thelever 143 is connected, at opposite sides ot its tulcrum, by links 150,to the collars137. lt will thus be seen that as the hand lever 146 isshifted back and forth the collars 137, and consequently the shovels127-123, will be moved apartand together, respectively.

ln the modification shown iii-Figs. 19 and 20, the trame l) is shown asof a width suiicient to a commodate two yokes 133, so that two units Dmay be carried, one at each side. Tn this event two push beams 110 areemployed, and, in order to provide suiiicient clearance for the crop rowthrough the yokes 33, the bracing mechanism 61-64 is substiby a bracingyoke 151, forwardly inends et which attach to the legs of the yoke D,while its upper horizontal bar is sfidably secured invbrackets 152,carried by is secured to the draw bar 169 by a bolt 156 which hasfreedom for vertical movement in the draw bar. The frame is alsoprovided with a roller or wheel 157 to limit the working depth ot thetools and prevent them Afrom going too deep into the ground. The frameis primarily carried or supported by set ot depending bars 153, thatconverge upwardly,

attachingV at their upper ends to a rearwardly extending supportingmember 159 'that'pivots to the frame 116, as at 160. The member 159 israised and lowered by a hand lever 161 that also pivots as at 160, andwith its shorter end engages under the member 159, The lever 161 issecured in various adjusted positions on a segment 162, but in orderthat' the frame may yield upwardly, asV when the shovels travel overlarge rocks and the like, the member 159 is raisable, with respect tothe lever 161, under the yielding action of a spring 1632 1t may benoted that when'the rear cult-ivator unit israised and lowered, by thehand lever' 161, it willv always maintain a substantially horizontalposition due to thesliding-action.

ot the bolt'156 in the draw bar 111, with a result that the shovels willalwaysoperate on www.-

a uniform level, whether working deep or shallow in the ground.

Attention is now directe-d to Figs. 21 to 29, inclusive, wherein isshown a tillage attachment in the form of a plowing unit. In this event,the frame C, which is transversely adbeam may be' turned or tilted, on alongitudijustable, as before, is provided with a casting 165, in one armof which is journaled the front end of ashaft 166, having al bevelpinion 167. The rear end of this shaft is mountec as at 168 and has ahand wheel 169. The

pinion 167` meshes with and drives a pinion 170 that threads on avertical shaft 171, so

that when the hand wheel 169 is turned'the f shaft 171 will be raise-dand lowered, as desired. At its lower end, the shaft 171 is bifurcated,as at 172, to pivotally receive the hub of a casting 17 3, and at itslower end the shaft 171 is also provided with ay lug 174 that isconnected and braced, with respect to the left side of the frame C, asby an adjustable tie rod, 175. In the present instance the push beam 110is slightly modified over the one previously described, it here beingprovided with an angular extension 176, that extends through the members172 and 173 to pivotally connect them. Upon the casting 173 istrimnioned a cast collar 177, to which is connected, by a vertical pivotpin 178, the front end of a plow beam 179 that carries a conventionalplow 180 at its rear. The plow and its nal axis, by turning the member177 on the casting 133. This is done, as follows: An actuator bar 181has an angular extension 182, at its lower end, that transversely pivotsin the member 177. The upper end of the bar engages and guides incrossed slots 183 and 184, at their intersection. The slots 184 are inparallel, spaced bracket arms 185 that are rigidily secured upon theshaft 171. The slot 183 is in a. plate 186 that guides between the arms185 and has a second slot 187, at an angle; with respect to the slot183, that guides on the shaft 171. The plato 186 continues in anintegrally formed central rod 188, with a handle 189 at its rear endwithin the control of the operator. t will now be seen that when theoperator moves the handle 189 forward, the bar 181 will be movedoutwardly in the slots 184, and the plow beam 179 will be tilted to theleft, and, conversely, the plow may be tilted to right by pulling thehandleV 189 rearwardly. This feature', i. e., the lateral tilting of theplow, we consider as of primary importance in a. tillage implement ofthis nature, as it enables the operator to accurately control the angleof the plow when working in uneven or rough soil conditions,

'f and thus prevents the natural tendency of the plow to drift to oneside or the other when it is improperly positioned in the` ground orwhen it has-a fixed relation to the tractor.

The plow 180 is raised from and lowered that slidahly engages in aslotted link 194,'i

iifhose lower end pivots 'to thel plow beam 179.

Thus, the plow may raise when riding over an obstruction, .and as thelink 194 has a limited sliding movement on the shaft 193 the plow beammay be swung laterally as groundH '75 and draft conditions may require.

?otfitab-ly. secured upon the shaft 193 is a collar 195, having anintegrally formed brackaim 196 that continues in a second arm a controlrod'198 having a notch forinis `ing loop 199 adapted to releasablyengage a rest pin 200, carried bythe hand lever 190.

TWhen Ythe loop 199 is seated over the' pin 200 the bracket arm 196 isin a raised position as 85 shown in Fig. 21. lVhen the rod 198 is liftedand moved forward, however, the bracket arm 196 drops to the dotted lineposition, immediately to the left of the plow beam, and

when this occurs itis seen that the plow"4 10 beam cannot move to theleft any more than the bracket 196 will permit. Ordinarily no suchbracing is required for the plow, as the hard ground to the left of thefurrow will suiciently offset the pressure reaction ini-"e5 partedby theturning earth strip. In plow` ling` over the last strip of a field,however, or

any other strip where the land-side of the -plow is not braced by firmearth, there will be a natural tendencyk of the plow to drift far to theleft, and to eliminate this, as well as the difliculty of attempting toguide the plow, under such circumstances, we have pi'ovided themechanism 195-200.

It will be seen from the foregoing that the plow 180 is mounted so thatit is under the complete control of the operator; that it can beadjusted in any manner desired; that itis guided by the widely spacedfront wheels,

which are more stable in their movement over 'rio the ground than therear, traction wheels; that the propelling power for the plow istransmitted directly through the beams and 179; and, that the rear,traction wheels will always travel on unplowed, firm soil,

all of which features combine to form an eiicient and-practical plowingmachine.

Itis understood that suitable modifications may be made in the generaldesign and structural details of the invention as herein shown, .1.20

provided, however, that said modifications come within the spirit andscope of the appended claims. Having now therefore fully shown anddescribed our invention, what we claim to be new and desire to protectby Let- '125 ters Patent is:

1. A tractor comprising a frame having an arched forecarriage securedagainst transverse tilting with respect to the frame, a. power plant onthe frame, a sleeve extending rear- 139 97- Extending rearwardly fromthe arm" "8o of. UB

wardly :from the frame for tiltably supporting the rear end thereof, atraction truck oscillat- Aably connected to the sleeve so as to betiltable with respect to the frame, and a power connection between thetruck and power plant.

V2. A tractor comprising a frame having Ianarched forecarriage securedagainst transverse tilting with respect to the frame, a power .plant onthe frame, a sleeve extending rearwardly from the frame for tiltablysupporting the rear end thereof, a traction truck oscillatably connectedto the sleeve so as to be tiltable with respect to the frame, and apower .connection extending from the power plant through the sleeve andto the traction truck.

3. A traction comprising an arched forecarriage, a frame secured at itsfront end to the forecarriage so as to be supported by and transverselytiltable therewith, an engine on the frame, a truck unit having a pairof tractionwheels disposed rearwardly of the frame, apivotal-supportingconnection between the rear end ofthe frame and the truck, and a powerconnection between the engine and the traction wheels.

4. A tractor comprising an arched forecarriage, a frame secured at itsfront end to the forecarriage so as to be supported by and transverselytiltable therewith, an engine on the frame, atruck unit having a pair oftraction wheels disposed rearwardly7 of kthe frame,fa pivotal supportingconnection between the rear end of the frame and the truck, and a powerconnection extending from the engine through the supporting connection:to the traction wheels of the truck.

5. A tractor comprising an arched forecarriage, a frame secured at itsfront end tol the forecarriage so as tobe supported by and transverselytiltable therewith, an engine on the frame,a truck unit having a pair oftrac- `tion wheels disposedrear-wardly of the frame, va sleeve extendingrearwardly from the frame to support the same, and a housing memberextending forwardly of the truck for pivotal supporting engagement withthe sleeve.

T6. A tractor comprising an arched forccarriage, a frame secured at itsfront end tothe forecarriage so as to 'be supported by and transversely`tiltable therewith, an engine on the frame, a truck unit having a pairYof traction wheels disposed rearwardly of the frame, a sleeve extendingrearwardly from the frame to support the same, and a Vhousing memberextending forwardly of the "truck for pivotal supporting engagementkwith thelsleeve, said sleeve and housing member serving as an enclosurefor the power drive `connection between the engine and the tractionwheels.

7. A 'tractor comprising a frame, an engine on the frame, an archedforecarriage at the frontend of the frame and held against transversetilting with respect thereto, a pair of tractionwheels arrangedrearwardly of the frame, a housing unit extending between the wheels andhaving longitudinal pivotal supporting engagement with the rear end ofthe frame, said housing having an intermediate transverse portion forsupporting engagement with the wheels, a differential mechanism in therear of the housing and having a pair of laterally arranged drivepinions for driving engagement with the traction wheels.

8. A tractor comprising a frame having an engine thereon, a tractiontruck tiltably supporting the vrear end of the frame, an archedforecarriage supporting the front end of the frame and held againsttransverse tiltl ing with respect thereto, said carriage having atransverse sliding connection with the frame, a transversely extendingbrace slidably bracing and connecting the frame and vvforecarriage, andmeans for transversely adjusting the forecarriage.

9. A tractor comprising a frame having an engine thereon, a tractiontruck tiltably supporting the rear end of the frame, an archedforecarriage supporting the front end of the fram-e and held againstVtransverse tilting with respect thereto, said carriage having atransverse sliding connection with the frame, and means independentofthe connection for slidably bracing the forecarriage with respect tothe frame.

10. A tractor comprising a frame having an engine thereon, a tractiontruck tiltably supporting the rear end of the frame, an archedforecarriage supporting the front end of the frame and held againsttransverse tilting with respect thereto, said carriage having atransverse sliding connection with the frame, transversely extendingmeans independent of the connection for bracing the forecarriage, andmanually operative screw acting means carried by the tractor forgradually adjusting the front end 0f the frame transversely with respectto the forecarriage.

In testimony whereof we afiix our signatures.

ROLAND WV. KNAPP. HOLLAND J. KNAPP.

Ell

